私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

The 3-miktoarm star-shaped ABC copolymers of polystyrene–poly(ethylene oxide)–poly(ethoxyethyl glycidyl ether) (PS-PEO-PEEGE) and polystyrene–poly(ethylene oxide)–polyglycidol (PS-PEO-PG) with low polydispersity indices (PDI
1.12) and controlled molecular weight were synthesized by a combination of anionic polymerization with ring- opening polymerization. The polystyryl lithium (PSLiþ) was capped by EEGE firstly to form the functionalized polystyrene (PSA) with both an active v-hydroxyl group and an v0-ethoxyethyl-protected hydroxyl group, and then the PS-b-PEO block copolymers, star(PS-PEOPEEGE) and star(PS-PEO-PG) copolymers were obtained by the ring-opening polymerization of EO and EEGE respectively via the variation of the functional end group, and then the hydrolysis of the ethoxyethyl group on the PEEGE arm. The obtained star copolymers and intermediates were characterized by 1HNMR
spectroscopy and SEC.